In winter feeding efforts are most satisfying to people and are of greatest benefit to birds.and are of greatest benefit to birds 为什么要加个of去掉of

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In winter feeding efforts are most satisfying to people and are of greatest benefit to birds.and are of greatest benefit to birds 为什么要加个of去掉of
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In winter feeding efforts are most satisfying to people and are of greatest benefit to birds.and are of greatest benefit to birds 为什么要加个of去掉of
In winter feeding efforts are most satisfying to people and are of greatest benefit to birds.
and are of greatest benefit to birds 为什么要加个of
去掉of

In winter feeding efforts are most satisfying to people and are of greatest benefit to birds.and are of greatest benefit to birds 为什么要加个of去掉of
这个是固定用法
be of +n（名词）=be+ adj（形容词）
相当于are the greastest beneficial to birds

把句子分一下，就非常清楚了。
这个句子可以分成两个部分：
第一：In winter feeding efforts are most satisfying to people
第二：In winter feeding efforts are of greatest benefit to birds.
be of benefit to somebody/something 是一个短语 ，所以不能去掉 of

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